Valravn fight was a classic. It was also the first time he used mantis shrimp in a fight. A good 1 vs 1.
Jake fight was crazy good, it had a lot of good moments, MC could be kinda evil too killing all the guards, it was a massacre. And then Deryl joined the fight, i was very intrigued.
Cole fight was awesome. MC managed to beat him even after power up. That was kinda crazy, but it was said before that the biggest difference is between level 2 and level 3 superhumans. Level 1 to 2 you get 20 power, but from Level 2 to 3 you get 200. So the weakest level 3 can have 3 times more power than the strongest level 2.
I don't think MC have that much plot armor compared to other stories, he loses some fights, and even the ones we can win have it's bad ends or you end needind assistence. I find him balanced overall.